Reamer



C. W. BALLE.

BEAMER.

APPLICATION FILED MAR. 24, |919.

1,402,039. Patented Ja11.3,1922.

IIHI l1 HHH 3mm/woz I cm1/25 w Bane.

- aen,

UNITE@ SFAFFLS CHARLES W. BALLE, 0F DETROIT, MICHIGAN.

BEAMER.

Application led March 24, 1919.

To all whom it may concern:

Be it known that I, CHARLES W. BALLn, a citizen of the United States ofAmerica, residing at Detroit, in the county of Wayne and State ofMichigan, have invented cer-v tain new and useful improvements inReamers, of which the following is a specification, reference being hadtherein to the accompanying drawings.

This invention relates to reamers and more particularly to reamers ofthe type comprising a longitudinally-channeled head, and cutting bladesdetachably engaging in the channels, the bottoms of the channels and ofthe blades having a gradual inclination to the axis of the head, wherebythe cutting diameter of the tool may be varied by a longitudinaladjustment of the blades in their channels.

lt is an object of the invention to so form the channels and the bladesof such a reamer that the blades will always seat securely in thebottoms of the channels, preventing any accumulation ofV dust or dirtunder the blades and consequent inaccuracies in adjustment.

It is a further object of the invention to provide a positive andeiiicient means for clamping the blades against any longitudinalmovement.

A preferred embodiment of the invention is illustrated in theaccompanying drawing.| wherein- Figure l is a view in side elevation andpartial section of the reamer;

Figure 2 is an end view of the same;

Figure 3 is a detail sectional view, the section being taken on line 3-3of Figure 2;

Figure 4 is a section taken through one of the blades on the line lofFigure l.

In these views, the reference character A designates a substantiallycylindrical reamer head having the adjustable cutting blades Brespectively engaging in longitudinal channels of said head with thebottoms of the blades and of the channels correspondingly inclined tothe axis of said head, as is common in the art. Prior constructions havebeen found open to the objection, however, that the blades sometimesassume a slightly spaced relation to the bottoms of the grooves, makingpossible the entrance of dirt or tine particles of metal under theblades, resulting in inaccuracies of adjust- Specification of LettersPatent.

Patented Jan. 3, 1922.

serial No. 284,738.

ment. Such conditions have been eliminated in the present inventionbyproviding one wall of each channel with an under-cut bevel, asindicated at B', and forming one laterall face of each blade with acorresponding bevel. -The other lateral faces B2 of the blades andchannels are preferably perpendicular to the bottoms of the latter. Forsimultaneously adjusting the blades, there may be provided the usualmeans comprising the nuts C and and D engaging the rear portion D of thehead A, which portion is threaded and of reduced diameter, the nut Dbeing adapted to bear upon the rear end faces of the blades. To restrainthe blades against forward movement after having been properly adjusted,there is associated with each blade one or more clamping devices, eachcomprising a clamping member E engageable with the blade face E2, and aclamping screw F passing through the member E and entering the head A ata gradual inclination to the face B2, as is best seen in Figure 2. Themember E is of a disc or button shape planed ofi at one side, asindicated at E', to form a bearing face for enging the blades. Themember E is engageable in a corresponding recess E2 in the member A soas to be substantially flush with said member when exercising itsclamping function. As may be seen in Figure 3, the head E and the recessreceiving said head are so shaped as to prevent the head from turningeven when the adjacent blade B is removed from the head. Thus, thebearing face E of the clamping member is always in proper position forengagement with the blades, avoiding any necessity for rotativemanipulation of said clamping member either before or after alongitudinal adjustment of the blades.

It is a further feature of the invention that the clamping member E ispositively disengaged from the adjacent blade when the screw F isloosened, and that the clamping member and its screw are permanentlyconnected as a unit. To accomplish both of these results the screw F isformed just below its head with an annular groove and a complementaryannular groove G is formed internally of the member E. The grooves F andG having been registered one with the other, a wire H is forced intosaid groove through an opening H in the face E of the clamping member,said wire being made to substantially embrace the screw, as is clearlysho-Wn in Figure 8. Thus, the screw is free to turn independently of theclamping member but may not be longitudinally disengaged therefrom. Topre vent locking of the blades B against out- Ward movement due toengagement of their beveled faces with the corresponding faces B of thechannels, the Width of the blade is made constant from front to back inany A plane parallel to the bottom of the blade,

as, for example, that which is shown in Fi re 4.

lhile the invention has been particularly described in its applicationto an adjustable reamer, it is to be understood that adjustable taps andany boring tools or cutters emcess to said channels, and a Wire engagingin said channels establishing a permanent connection between said screwand clamping member.

In testimony whereof I aiix my signature.

CHARLES W. BALLE.

